This specific 3D model, "Catapult Low-poly 3D model order", is an asset made available by "Unknown author".
You can download this asset for free at "Unknown platform" by following the link.
The license for this digital asset is "Unknown license".
OBJ (OBJ, filesize: 467 KB), PNG (PNG, filesize: 6.25 MB), FBX (Autodesk FBX, filesize: 287 KB), 3DS (3D Studio, filesize: 220 KB)